refactor: resolve warnings

Author: KisaragiEffective

clippy_lints/src/redundant_closure_call.rs

@@ -6,7 +6,7 @@ use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::intravisit::{Visitor as HirVisitor, Visitor};
-use rustc_hir::{intravisit as hir_visit, AsyncCoroutineKind, CoroutineKind};
+use rustc_hir::{intravisit as hir_visit};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::hir::nested_filter;
 use rustc_middle::lint::in_external_macro;
@@ -62,7 +62,7 @@ impl<'tcx> Visitor<'tcx> for ReturnVisitor {
 }
 
 /// Checks if the body is owned by an async closure
-fn is_async_closure(cx: &LateContext<'_>, body: &hir::Body<'_>) -> bool {
+fn is_async_closure(body: &hir::Body<'_>) -> bool {
     // NB: `async || 42` is desugared into `|| |mut __context: #[lang = "ResumeTy"] | 42`; so
     //     we need to check if there is inner closure and check GeneratorKind of the inner one.
     if let hir::ExprKind::Closure(closure) = body.value.kind